was going down "fall-line" on a relatively flat hill with a decent amount of speed at a local ski club, some ~15-16 year-old comes traversing from behind and runs right into me, elbows me in the ribs. He immediately gets up and says "don't worry about it, nobody is hurt" like it's my fault and just rides away. I couldn't even cuss at him because I was so winded lol. Laid there for a few minutes and went away after.